facemask and chin cup
DESCRIPTION
Facemask and Chin cup. Dr Abdul Jabbar. What are facemasks and chin cups?. Growth modification appliances for skeletal Class III. CLASS III MALOCCLUSION. The relative mesiodistal relation ship of arches are abnormal with all the lower teeth occluding mesial to - PowerPoint PPT PresentationTRANSCRIPT
Dr Abdul Jabbar
Facemask and Chin cup
Growth modification appliances for skeletal Class III.
What are facemasks and chin cups?
CLASS III MALOCCLUSION
The relative mesiodistal relation ship of arches are
abnormal with all the lowerteeth occluding mesial to normal ,producing markeddisharmony in the incisor
region and in the facial lines.
Abnormal relationship in which the mesiobuccal cusp of max. first permanent molar occludes distal to the buccal groove of mandibular first molar.
CLASS III MOLAR RELATION SHIP
DENTALFUNCTIONAL
SKELETAL
TYPES OF CLASS III MALOCCLUSION
Short Maxilla
Prognathic Mandible
Composite
Early loss of lower e`s
Dental Class III
FEATURES No apparent saggital discrepancy
ANB angle is with in normal limits
Lingual tipping of max. incisors & labial tipping of mand. incisors
DENTOALVEOLAR MAL-RELATIONSHIP
ETIOLOGICAL FACTORS FUNCTIONAL (PSEUDO)
CLASS III MALOCCLUSION
Ectopic eruption of maxillary central incisors
Premature Contact
Premature loss of C`s
Dental factors
• Anomalies in tongue position • Neuromuscular features
• Naso-respiratory or airway problems
Functional factors
Minor transverse maxillary discrepancy
Skeletal Factor
Mandible appear morphologically normal
Class I or mild Classlll sk. Relationship
Ant. cross bite and negative over jet is present due to a ant Displacement of mandible
Mandible can be pushed back to edge-edge relationship
FEATURES OF PSEUDO CLASS III
1. GROWTH MODIFICATION Pre Adolescents (late childhood ,
juvenile) Adolescents (v. minimal effects)
2. CAMOFLOUGE (MILD) Adolescents Adults
3. Orthognathic SURGERY (moderate –severe)
Post adolescents Adults
SK CLASS III
CAUSES DEFICIENT MAXILLA PROGNATHIC MANDIBLE COMPOSITE
GROWTH MODIFICATION
Orthopedic face mask correct classIII malocclusion in:
Late decidious or early permenant dentition
Changes produced in all three plane of spaces
FACE MASK THERAPY
Correction of CO_CR discrepancy Maxillary sk. Protraction Forward movement of max.dentition Lingual tipping of lower incisors Redirection of mand. Growth in more
vertical direction
TREATMENT EFFECTS PRODUCED BY FACE MASK THERAPY
TREATMENT IN GROWING PATIENTS(pre- adolescents , adolescents)
• Skeletal Class III with Short Maxilla
FR 3 (22-23 hrs)
Effects
• Forward mov.of maxilla• Proclination of upper incisors• Backward rotation or repositioning of mand. • Increase in lower ant. Facial height • lingual tipping of lower incisors
TREATMENT IN GROWING PATIENTS(pre adolescents , adolescents)
• Composite Skeletal Class III -ive Family History
Face Mask or Reverse Headgear
Effects
• Maxillary sk. Protraction• Forward movement of max.dentition• Lingual tipping of lower incisors • Redirection of mand. Growth in more vertical direction
Pre-requisite Maxillary Expansion
Treatment effects of facemask
Incease in overjet (4.4 mm)Mesial mov. &flaring of upper incisors & up righting of lower incisors
& correction of molar position towards class I molar correction(3.1 mm)mesial mov. Of maxilla
Skeletal effects ANB angle (2.4-2.8)& Witts
appraisal(witts value 2.6mm)
Treatment effects
DEFICIENT MAXILLA/COMPOSITE III
Expansion + face mask 8 yrs ideal age for maxillary protraction. more the age of the patient ,less will be the skeletal effects. early ages treatment ensures better skeletal effects.
Treatment & Management
in Pre-adolescence
Criterea for facemask:1. Short face Normal face2. Lower incisors either normally
inclined or proclined.3. Upper incisors must be either
retroclined or normally inclined.4. Growing 8yrs age ideal for facemask
Facial mask Bonded max. expansion splint Heavy elastics
Components of orthopedic facial mask therapy
Orthopedic face correct classIII malocclusion in
Late decidious or early permenant dentition
Changes produced in all three plane of spaces
FACE MASK THERAPY
Facemask therapy often follows maxillary expansion since the latter disrupts the circummaxillary sutural system and facilitates the orthopedic effects of the facemask
children treated at an early age, showed a
significant forward displacement of the maxillary complex and a significant upward and forward direction of condylar growth, leading to smaller increments in total mandibular length
Facial mask
1. Delaire facemask
2. Petit facemask
Types of facemasks
made of two pads that contact the soft tissue in the forehead and chin regions..
The pads are connected by a rod
In the center of the midline framework is adjustable crossbow to which elastics are connected bilaterally
Facial mask
The second component of this orthopedic treatment is the maxillary splint. an acrylic and wire maxillary expansion appliance that is bonded to the posterior dentition.
In mixed dentition cases, the splint usually covers the first and second deciduous molars.
The upper canines may also be included in patients who present with complete deciduous dentitions.
2 .Max.expansion splint
maxillary splint is made of a framework of .045“(1.2mm) round stainless steel wire, to which an expansion screw is attached.
If second molars are present, an occlusal rest is extended to the second molars to prevent overeruption of these teeth during treatment (Two hooks, to which elastics are attached, are soldered to the wire framework.
These hooks usually lie adjacent to the canines or first deciduoud molars.
Max.expansion splint
, Rapid palatal expansion can produce a slight forward movement of Point A and a slightdownward and forward movement of the maxilla.
In the context of facial mask therapy, the effect of such expansion is to disrupt the maxillary sutural system, thus possibly enhancing the effect of the orthopedic facial mask by making sutural adjustments occur more readily.
Max.expansion splint
Another advantage of maxillary expansion is the correction of the posterior crossbite that often accompanies a Class III malocclusion because of deficient transverse maxillary growth and the abnormal anteroposterior relationship of maxilla to mandible.
In addition, a palatal expansion appliance splints the maxillary dentition during protraction and helps transmit force from the teeth to the maxilla, thus limiting unwanted tooth movement.
The patient is usually instructed to turn the midline jackscrew of the appliance once daily, generally before bedtime.
In the majority of Class III individuals in whom use of an orthopedic facial mask is indicated, some maxillary expansion is beneficial. In such a case, the maxillary splint is expanded until the desired transverse change is achieved.
Activation of splint
In instances in which no transverse change is necessary, the maxillary splint is activated once a day for eight days to produce a disruption in the sutural system that facilitates the action of the facial mask
Activation of splint
The facial mask is secured to the face by stretching elastics from the hooks on the maxillary splint to the crossbow of the facial mask
Heavy forces are generated, usually through the use of 5/16", 14oz elastics bilaterally.
Lighter forces may be used during the break-in period, but forces should be increased as the patient adjusts to the appliance.
Heavy elastics
Optimally, the patient is instructed to wear the facial mask on a full-time basis except during meals.
Young patients (5 to 9 years old) can usually follow this regimen, particularly if the patient is told that the full-time wear will last only three to five months.
In older patients, full-time wear may not be possible, in which case the appliance should be worn at all times except when the patient is in school or participating in contact sports
INSTRUCTIONS
The facial mask is usually worn until a positive overjet of 2-4mm is achieved interincisally. At this time, part-time or nighttime wear is recommended for an additional three to-six-month retention
FR-3 Frankel appliance1 can be worn as an active retainer.
FACIAL MASK
Extra oral force application can be accomplished in 2 ways:
1. EO force through condyles2. EO force below the condyles.
Skeletal classIII with large mandible
Chin cup Types of chin cup
What appliance?
Pre adolescents, mild, no family history, low angle
Chin Cup Adolescents ,mild Class III ,low angle. Chin Cup or surgical preparation.Adults Camoflouge of surgery
SKELATAL CLASS III WITH LARGE MANDIBLE
Mandibular growth mechanisms1. functional matrix theory2. displacements primary and s secondary.3. Growth sites and growth centers.4. Drift , relocation, sub periosteal
deposition and resorption, modelling,remodelling.
growth philosophy
TREATMENT IN GROWING PATIENTS
Skeletal Class III with Prognathic Mandible-ive Family History
1. Reverse Twin Block ( appliances without lip pads)
2. Chin Cup 1. Occipital Pull
2. Vertical Pull
150-300 gm per side (INITIALLY)450-700 gm (if force is directed through condyle & slightly less if below the condyle)14 hrs per dayAfter correction of cross bite wear only at night as retention appliance
CHIN CUP TYPE HEAD GEAR
Chin cup types
1.OCCIPITAL- PULL CHIN CUP
2.VERTICAL PULLCHIN CUP
Mild to moderate mand. Prognathism Short lower ant. Facial hgt. Normally positioned or slightly
proclined lower incisors(some backward tipping of lower incisors)
OCCIPITAL- PULL CHIN CUP
Chin cup
If below the condyle-----downward
&backward rotation of mandibleIf no opening of mand. Plane is
required forceshould be directed through condyle to help restrict mand. Growth.
Direction of pull of chin cup
150-300 gms per side (INITIALLY)OVER NEXT 2 MON. 450-700 grams(if force is directed
through condyle & slightly less if below the condyle )(16-24 ounce)
14 hrs per day After correction of cross bite wear
only at night as retention appliance.
FORCE
INDICATIONS Inc. ant. vertical dimention Steep mand. Plane angle
VERTICAL PULLCHIN CUP
If no Inc. in lower ant. Facial ht. is required
EFFECTS PRODUCED
Dec. in Mandibular Plane angle & Gonial angle
Increase in posterior face height.
2.VERTICAL PULLCHIN CUP
A-Unitek B-Summit
Could be I. pre formedII. custom made metallic plastic Talcum powder Soft chin cups Vs hard chin cups
Clinical Management
Mandibular growth is redirected in downward and backward direction.
Increased LAFH LI are retroclined. Decreased chin prominence.
Effects of chin cup therapy
Effects of chin cup therapy